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d1 = d2.
(Vp+Vw)*t1 = (Vp-Vw)t2.
(150+Vw)*2 = (150-Vw)*3. Vw = ?.
(Vp+Vw)*t1 = (Vp-Vw)t2.
(150+Vw)*2 = (150-Vw)*3. Vw = ?.